president obama, a trio of former u.s. presidents will attend mandela's memorial service on tuesday. we go to johhannesburg now. you've been discussing this move and what it meendz to spend the next few days celebrating nelson mandela. tell us more about that and what you've been seeing today. >> well, you can hear it as well. this constant lament, this constant song of thanks just around me here in the streets. people continue to come here. it's becoming like a pilgrimage, i think. and just remember, this is a very suburban street in a quiet wealthy area of johannesburg and ten blocks that way, eight blocks that way, people are parking their cars and walking, pushing strollers, bringing their children along, elderly people coming with bouquets of flowers. others have picked flouers from their gardens. this is a very south african affair. it's a mandela's south africa. it is such a multiracial crowd. you have people from all walks of life. and i think if there is ever any tribute to nelson mandela and the leadership that h